JN0-102 Practice Questions Free – 50 Exam-Style Questions to Sharpen Your Skills
Are you preparing for the JN0-102 certification exam? Kickstart your success with our JN0-102 Practice Questions Free – a carefully selected set of 50 real exam-style questions to help you test your knowledge and identify areas for improvement.
Practicing with JN0-102 practice questions free gives you a powerful edge by allowing you to:
- Understand the exam structure and question formats
- Discover your strong and weak areas
- Build the confidence you need for test day success
Below, you will find 50 free JN0-102 practice questions designed to match the real exam in both difficulty and topic coverage. They’re ideal for self-assessment or final review. You can click on each Question to explore the details.
You have configured a firewall filter with a single term matching on packets with a source address in the 10.0.0.0/24 subnet. This term only includes the count action. Which two statements are true about traffic evaluated by this firewall filter? (Choose two.)
A. Packets outside the 10.0.0.0/24 subnet will be accepted.
B. Packets outside the 10.0.0.0/24 subnet will be rejected.
C. Packets outside the 10.0.0.0/24 subnet will be counted.
D. Packets outside the 10.0.0.0/24 subnet will not be counted.
What are three characteristics of Layer 2 switches? (Choose three.)
A. Layer 2 switches forward broadcast traffic.
B. Layer 2 switches forward traffic addresses to hosts that reside on the same collision domain.
C. Layer 2 switches separate multicast domains.
D. Layer 2 switches separate collision domains.
E. Layer 2 switches forward traffic addressed to hosts that reside on a different collision domain.
-- Exhibit -- user@router> show configuration groups { ge-int { interfaces { { unit 0 { familyinet { address 10.10.12.1/24; } } } } } } ... interfaces { ge-0/0/1 { unit 0; } -- Exhibit -- Referring to the exhibit, which two actions would you take to only apply the 10.10.12.1/24 address to the ge-0/0/1.0 interface?
A. Apply the ge-int group to the configuration at the [edit] hierarchy.
B. Apply the ge-int group to the configuration at the [edit interfaces ge-0/0/1] hierarchy.
C. Apply the ge-int group to the configuration at the [edit interfaces ge-0/0/1 unit 0] hierarchy.
D. Apply the ge-int group to the configuration at the [edit interfaces] hierarchy.
You configured an interface with an IP address and committed the change. You then committed a change that added an exception in a firewall filter to allow this network through the filter. You realize that this work was done on the wrong router. How do you undo all these changes?
A. rollback 2
B. rollback 1
C. rollback 0
D. rollback 3
At which layer of the OSI model does error checking occur with IPv6?
A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 7
What is a route filter?
A. a list of prefixes that can be configured in a policy
B. a single prefix that is configured separately, and can be referenced in a policy
C. a list of prefixes that is configured separately and can be referenced in a policy
D. a single prefix that can be configured within a policy
Which statement is true about the routing table?
A. The routing table exists in the control plane only.
B. The routing table exists in the control plane and in the forwarding plane.
C. The routing table contains both active and inactive routes.
D. The routing table is stored on compact flash.
What are three characteristics of UDP? (Choose three.)
A. UDP is faster than TCP.
B. UDP operates at the Transport Layer.
C. UDP is connection-oriented.
D. UDP data is sent best-effort.
E. UDP is more reliable than TCP.
Which word starts a command to display the operational status of a Junos device?
A. put
B. set
C. show
D. get
Which command will display the active configuration?
A. user@router> show configuration
B. user@router# show
C. user@router> show system configuration
D. user@router> show system commit
Random early detection (RED) is associated with which class of service component?
A. classification
B. policing
C. queuing
D. scheduling
The authentication order configuration on your M120 includes the settings tacplus and radius (in that order), but does not include the password parameter. You attempt to log in to the device, but the network containing the authentication servers is currently down. Which statement is true about your login attempt?
A. The login attempt is rejected.
B. The login attempt is automatically accepted after the authentication servers timeout value is reached, since there are no other authentication methods available.
C. The M120 automatically tries authenticating locally on the device after the authentication servers’ timeout value is reached.
D. The M120 automatically tries authenticating locally on the device before using external authentication.
What must you type to enter operational mode from the root@% command prompt?
A. exit
B. configure
C. edit
D. cli
Which two statements are correct regarding default protocol preference values? (Choose two.)
A. RIP is preferred over OSPF external routes.
B. Direct, local, and static routes have the same preference value.
C. OSPF’s preference value is lower than BGP.
D. OSPF has a single preference value for both internal and external routes.
What are two valid actions for a routing policy? (Choose two.)
A. discard
B. next policy
C. accept
D. ignore
What are two Junos processes? (Choose two.)
A. OSPF SPF daemon (ospfd)
B. SNMP daemon (snmpd)
C. BGP daemon (bgpd)
D. Routing protocols daemon (rpd)
Which command prompt indicates that you are in operational mode?
A. user@router&
B. user@router#
C. user@router%
D. user@router>
-- Exhibit -- [edit routing-options] user@router# show static { defaults { metric 10; preference 10; } route 10.10.10.0/24 { next-hop 192.168.100.1; qualified-next-hop 192.168.200.1; preference 6; } metric 8; } } -- Exhibit -- Given the configuration shown in the exhibit, which statement is correct about traffic matching the route 10.10.10.0/24?
A. It will be forwarded to 192.168.100.1 using a metric of 10.
B. It will be forwarded to 192.168.100.1 using a metric of 8.
C. It will be forwarded to 192.168.200.1 using a metric of 8.
D. It will be forwarded to 192.168.200.1 using a metric of 10.
What are three acceptable modifiers to a terminating action of a firewall filter? (Choose three.)
A. Policer
B. Count
C. Syslog
D. Log
E. Discard
Which two statements are true about TCP communication? (Choose two.)
A. The receiver acknowledges the final packet in each communications stream.
B. The receiver adds sequencing numbers to the packets received.
C. The sender adds sequencing numbers to the packets it sends.
D. The receiver acknowledges each packet it receives from the sending device.
Which routing table stores IPv4 unicast routes and is used by multicast routing protocols to prevent loops?
A. inet.0
B. inet.1
C. inet.2
D. inet.3
At which command prompt would you issue the set date command?
A. [edit chassis] user@router#
B. [edit] user@router#
C. [edit system] user@router#
D. user@router>
What does the command show | compare rollback 1 display?
A. the difference between the current candidate configuration and the candidate configuration from one commit ago
B. the difference between the current active configuration and the current candidate configuration
C. the difference between the current active configuration and the active configuration from one commit ago
D. the difference between the current candidate configuration and the archived configuration from one commit ago
Which Junos release would address only bug fixes that were not contained in the 15.1R1 version of code?
A. 15.1R2
B. 15.1X2
C. 15.1S2
D. 15.1F2
Which command would you use to view interface usage details in real time?
A. show interfaces terse
B. show interfaces extensive
C. monitor interface traffic
D. monitor traffic interface
Which process is responsible for the routing protocols on a Junos device?
A. rpd
B. mgd
C. dcd
D. chassisd
-- Exhibit -- [edit policy-options] user@router# show policy-statement block-routes { term 1 { from { route-filter 172.27.0.0/24 longer; } then reject; } term 2 { then accept; } } -- Exhibit -- You are asked to ensure that your device does not accept any prefixes within the 172.27.0.0/24 network. You have applied the policy shown in the exhibit, but the 172.27.0.0/24 route is still present on your device. Which configuration will resolve this problem?
A. [edit policy-options policy-statement block-routes] user@router# set term 1 from route-filter 172.27.0.0/24 orlonger
B. [edit policy-options policy-statement block-routes] user@router# set term 1 from route-filter 172.27.0.0/24 upto /30
C. [edit policy-options policy-statement block-routes] user@router# set term 2 from route-filter 172.27.0.0/24 longer
D. [edit policy-options policy-statement block-routes]
Which simplified IPv6 address is the same as the IP address 2001:0000:1000:0000:0000:cbff:0020:0001/64?
A. 2001::1::cbff:2:0001/64
B. 2001::1000::cbff:20:1/64
C. 2001:0:1000::cbff:20:1/64
D. 2001:0:1:0:0:cbff:2:1/64
-- Exhibit -- [edit interfaces ge-0/0/6] user@router# show unit 0 { familyinet { address 172.16.10.100/24; address 172.16.10.101/24; } } -- Exhibit -- You have two IP addresses configured on the ge-0/0/6 interface, as shown in the exhibit. You want to select the 172.16.10.101 address as the source address for packets sent from this interface to hosts on a remote subnet. Which parameter would you add to the 172.16.10.101 address to complete this task?
A. preferred
B. broadcast
C. primary
D. arp 172.16.10.101
-- Exhibit -- user@router> show route protocol static inet.0: 12 destinations, 12 routes (12 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 192.168.1.128/27 *[Static/5] 00:03:13 >to 10.20.106.10 via fe-0/0/5.1 192.168.1.144/29 *[Static/5] 00:03:13 >to 10.20.14.131 via ge-0/0/0.0 192.168.1.192/27 *[Static/5] 00:03:13 >to 10.18.1.1 via ge-0/0/1.0 192.168.1.128/28 *[Static/5] 00:01:06 >to 10.20.14.130 via ge-0/0/0.0 -- Exhibit -- Given the routing entries shown in the exhibit, which next-hop IP address will be used for the destination IP address 192.168.1.142? (Assume that only static routes are available for the destination.)
A. 10.20.106.10
B. 10.20.14.131
C. 10.18.1.1
D. 10.20.14.130
-- Exhibit -- user@router> show route protocol static inet.0: 15 destinations, 15 routes (15 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 99.0.0.0/17 *[Static/5] 00:00:11 >to 10.1.1.2 via ge-0/0/1.0 99.0.0.0/19 *[Static/5] 00:00:11 >to 10.1.2.2 via ge-0/0/2.0 99.0.0.0/24 *[Static/5] 00:00:11 >to 10.1.3.2 via ge-0/0/3.0 99.0.0.0/26 *[Static/5] 00:00:11 >to 10.1.4.2 via ge-0/0/4.0 -- Exhibit -- In the exhibit, there are four static routes that route traffic through different interfaces. Which interface does the router use if traffic is sent to the 99.0.0.1 destination?
A. ge-0/0/1
B. ge-0/0/2
C. ge-0/0/3
D. ge-0/0/4
What is the network address for the 10.13.147.100/19 host?
A. 10.13.128.0
B. 10.13.147.0
C. 10.13.0.0
D. 10.13.100.0
-- Exhibit -- user@router> restart ^ unknown command. -- Exhibit -- You are investigating routing problems on a device running the Junos OS. You receive the error shown in the exhibit when you attempt to restart the routing process. Which statement describes the problem?
A. You have typed an invalid command.
B. You must be in configuration mode to restart the routing process.
C. You do not have permission to restart the routing process.
D. You must wait until close of business to restart the routing process, based on user-defined policy.
For the interface ge-1/2/3.4, what does "ge" represent?
A. SONET/SDH
B. Gigabit Ethernet
C. Aggregated Ethernet
D. GRE
-- Exhibit -- [edit routing-options] user@router# show static { route 0.0.0.0/0 { next-hop 10.1.1.1; qualified-next-hop 10.1.1.254 { preference 4; } } } -- Exhibit -- Assuming both paths shown in the exhibit are available, which statement is correct?
A. Traffic matching the default route will use 10.1.1.1 as the next hop.
B. Traffic matching the default route will use 10.1.1.254 as the next hop.
C. Traffic matching the default route will be load-balanced per packet across both next hops.
D. Traffic matching the default route will be load-balanced per flow across both next hops.
How do you save the current candidate configuration in the set format to permanent storage media?
A. [edit] user@router# show | set | save /var/tmp/current.conf
B. [edit] user@router# show | compare set | save /var/tmp/current.conf
C. [edit] user@router# save /var/tmp/current.conf | display set
D. [edit]
You accidentally configured interface so-0/0/0.0 with /32 instead of /30. Which two solutions could you use to correct this configuration? (Choose two.)
A. [edit interfaces so-0/0/0.0] user@router# replace family inet address /32 with /30
B. [edit interfaces so-0/0/0.0] user@router# rename family inet address /32 to address /30
C. [edit] user@router# replace interface so-0/0/0.0 family inet address /32 with address /30
D. [edit interfaces so-0/0/0.0] user@router# delete family inet address
Which interface type connects the control and forwarding planes on an MX Series device?
A. fxp1
B. fxp0
C. me0
D. ae1
Which two statements are correct about the request system zeroize local command? (Choose two.)
A. The command removes all data files.
B. The command preserves the management interface addresses.
C. The command resets all key values.
D. The command removes all user-created files from the system.
What is the network ID address of the IPv4 subnet that includes the IP address 114.180.192.120/28?
A. 114.180.192.100/28
B. 114.180.192.118/28
C. 114.180.192.112/28
D. 114.180.192.106/28
-- Exhibit -- [edit interfaces ge-0/0/1] user@router# show unit 100 { vlan-id 100; family inet { address 10.1.1.1 /24; } } [edit interfaces ge-0/0/1] user@router# commit check [edit interfaces ge-0/0/1] 'unit 100' Only unit 0 is valid for this encapsulation error: configuration check-out failed -- Exhibit -- Referring to the exhibit, you are unable to commit the configuration for the ge-0/0/1 interface. What must you do to commit the configuration?
A. You must set the vlan-tagging parameter under the [edit interfaces ge-0/0/1] hierarchy.
B. You must use the rename command to change unit 100 to unit 0.
C. You must set the encapsulation flexible-ethernet-services parameter under the [edit interfaces ge-0/0/1] hierarchy.
D. You must set the encapsulation vlan-ccc parameter under the [edit interfaces ge-0/0/1 unit 100] hierarchy.
-- Exhibit -- user@router> show route inet.0: 9 destinations, 9 routes (9 active, 0 holddown, 0 hidden) + = Active Route, - = Last Active, * = Both 10.10.10.91/32 *[Direct/0] 00:09:40 >via lo0.0 10.10.10.92/32 *[OSPF/10] 00:01:50, metric 1 >to 172.16.1.2 via ge-0/0/2.0 100.100.1.0/24 *[Static/5] 00:01:50 Reject - 172.16.1.0/24 *[Direct/0] 00:06:09 >via ge-0/0/2.0 172.16.1.1/32 *[Local/0] 00:06:09 Local via ge-0/0/2.0 - 192.168.0.0/16 *[Aggregate/130] 00:00:06 Reject - 192.168.0.0/17 *[Aggregate/130] 00:00:06 >to 172.16.1.2 via ge-0/0/2.0 192.168.50.0/24 *[Static/5] 00:00:06 >to 172.16.1.2 via ge-0/0/2.0 192.168.51.0/24 *[Static/5] 00:00:06 >to 172.16.1.2 via ge-0/0/2.0 user@router> show configuration policy-options policy-statement demo { term 1 { from { route-filter 192.168.0.0/16 longer accept; } then reject; } } user@router> show configuration protocols ospf export demo; area 0.0.0.0 { interface ge-0/0/2.0; } -- Exhibit -- Given the configuration and routing table shown in the exhibit, which routes will be advertised to OSPF neighbors because of the demo policy?
A. 192.168.0.0/16 only
B. 192.168.0.0/17 only
C. 192.168.50.0/24 and 192.168.51.0/24
D. 192.168.0.0/17, 192.168.50.0/24, and 192.168.51.0/24
What is a valid IPv6 address?
A. 00:05:85:23:45:67
B. 127.0.0.1
C. 2001:0db8:3000:2215:0000:0000:aaaa:1111
D. 49.0001.0192.0168.1001.00
Which two commands may be used when configuring an IP address for a Gigabit Ethernet interface? (Choose two.)
A. set interfaces ge-0/0/0.0 address 10.1.1.1/24
B. set interfaces ge-0/0/0.0 family inet address 10.1.1.1/24
C. set interfaces ge-0/0/0 unit 0 family inet address 10.1.1.1/24
D. set interfaces ge-0/0/0 address 10.1.1.1/24
What is a valid option when using the ping command?
A. packet loss
B. packet size
C. CRC
D. TCP port
What is the central processing component of the forwarding plane?
A. PFE
B. RE
C. Junos OS
D. forwarding table
Which information would you find using the CLI help function? (Choose two.)
A. message of the day
B. tip of the day
C. explanation for specific system log error messages
D. explanation for specific traceoptions log messages
What are two valid match criteria for a routing policy? (Choose two.)
A. OSPF area ID
B. prefix list
C. port
D. time-to-live (TTL)
Which two commands would you use to view OSPF routes? (Choose two.)
A. show ip route ospf
B. show ospf routes
C. show route protocol ospf
D. show route
Which of the following commands will configure the maximum transmission unit size of a fast Ethernet interface?
A. set interfaces fe-0/0/0 unit 0 ethernet-options mtu 1200
B. set interfaces fe-0/0/0 mtu 1200
C. set interfaces fe-0/0/0 unit 0 mtu 1200
D. set interfaces fe-0/0/0.0 mtu 1200
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